Buying Guides | BioLab™

How to Choose a Tennis Racket

Head size, weight, balance, stiffness — decoded

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1. Head Size: Your Sweet Spot

Head size is the single most important factor for beginners and intermediates. Larger heads = larger sweet spot = more forgiveness.

Head Size	Category	Best For
85-93 sq in	Mid / Sub-95	Advanced players, control seekers
95-100 sq in	Mid-Plus (Most Popular)	Intermediate to advanced, balanced game
100-110 sq in	Oversize	Beginners, comfort seekers, doubles

2. Weight: The Hidden Variable

Racket weight affects everything — power, maneuverability, stability, and arm health.

Weight	Category	Best For
Under 270g	Ultra-Light	Beginners, juniors, players with arm issues
270-295g	Light-Mid	Intermediate, recreational players
300-315g	Mid-Heavy (Tour)	Advanced, competitive players
320g+	Heavy Tour	Professional-level players

3. Balance: Where the Weight Lives

Head-Heavy (6+ pts HL): More power on serves and groundstrokes. Good for baseline players.
Even Balance: Versatile. Good for all-court game.
Head-Light (6+ pts HL): More maneuverable at the net. Good for serve-and-volley and doubles.

4. Stiffness (RA Rating)

RA Rating	Feel	Power	Comfort
Under 63	Flexible	Low-Mid	Excellent
63-67	Medium	Medium	Good
68-72	Stiff	High	Firm
73+	Very Stiff	Very High	Low

Beginner Recommendation

100-105 sq in head size
270-290g weight
Even balance
RA 63-68 stiffness
Open string pattern (16×19)

Beginner Mistakes to Avoid

Buying a pro's racket too early
Using a very stiff frame
Stringing at too high tension
Ignoring grip size importance

How to Choose Tennis Shoes

Surface, fit, durability, cushioning

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1. Surface Matters Most

Using the wrong sole on the wrong surface is the #1 cause of tennis shoe injuries and premature wear.

Surface	Sole Type	Key Feature
Hard Court	Modified herringbone	Durability, all-direction grip
Clay	Full herringbone / nubs	Clay release, sliding ability
Grass	Nubs / pimples	Low profile, gentle on grass

2. Fit Requirements

Width: Your tennis shoe should be snug but not tight. You need lateral support.
Toe Box: ~1cm of space in front. Your foot slides forward on stops.
Heel Lock: Zero heel slippage. The heel cup should grip firmly.
Break-in: Tennis shoes should feel good out of the box. No break-in period needed.

3. Cushioning & Support

If you have knee or back issues, prioritize cushioning (ASICS Gel, Nike Zoom Air, Adidas Boost). If you're aggressive and need stability, look for medial support posts and torsion bars.

4. Durability Expectations

Recreational players (2-3x/week): Replace every 6-9 months
Competitive players (4-5x/week): Replace every 3-4 months
Toe draggers: Look for toe guard reinforcement or dr-specific models

How to Choose Tennis Strings

Material, gauge, tension — the complete guide

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1. String Materials Compared

Type	Feel	Power	Spin	Durability	Cost
Natural Gut	Excellent	Excellent	Very Good	Good	$$$$
Multifilament	Excellent	Good	Good	Fair	$$$
Co-Polyester	Good	Good	Excellent	Good	$$
Polyester	Firm	Average	Excellent	Good	$$
Nylon	Average	Average	Average	Good	$
Kevlar	Very Firm	Low	Low	Excellent	$$

2. Gauge (Thickness)

Thinner strings = more feel, spin, and power but less durability. Thicker strings = more durability but less feel.

Gauge	mm	Best For
18L	1.15	Maximum feel, advanced players
17L	1.20	Feel players, spin seekers
17	1.25	Most popular all-around
16L	1.30	Good durability with decent feel
16	1.35	Durability priority, frequent stringers
15L	1.40	Maximum durability

3. Hybrid Stringing

A hybrid setup uses different strings in the mains (vertical) and crosses (horizontal). Classic combos:

Poly mains + Gut crosses: Spin + comfort. Used by many pros.
Poly mains + Multifilament crosses: Spin + arm comfort. Great for club players.
Rough poly mains + Smooth poly crosses: Maximum snap-back and spin.

4. Our Recommendation

For Most Players

Luxilon ALU Power 125 (1.25mm)
Or RPM Blast 125 for more spin
String at 48-52 lbs
Replace every 15-20 hours

For Arm-Sensitive Players

Wilson NXT 16 (multifilament)
Or natural gut if budget allows
String at 50-54 lbs
Softer = more comfortable

How to Choose Tennis Balls

Pressurised vs pressureless, by surface and level

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1. Pressurised vs Pressureless

Type	Feel	Longevity	Cost (long-term)
Pressurised	Bouncy, lively	3-4 hours play, then dead	$$$
Pressureless	Firm, consistent	Months of play	$$

2. Tournament Balls vs Practice Balls

Tournament/Grade A: WTA/ATP approved. Specific felt, precise bounce. Wilson US Open, Dunlop AO, Babolat Roland Garros, HEAD Wimbledon.
All Court / Grade B: Good for club play. Usually "X-all-court" branded.
Practice / Coach: Extra duty felt for hard courts, or clay-specific balls. More durable but not tournament spec.

3. Pressureless & Low-Compression Balls

Red (Stage 3 / Mini): Under 5 years old. Unpressurised, very soft.
Orange (Stage 2): Ages 5-8. 50% compression of standard ball.
Green (Stage 1): Ages 8-10. 75% compression. Transition to full court.

4. Our Picks

Best Overall: Wilson US Open — consistent at all altitudes, great felt.
Best for Clay: Babolat Roland Garros — extra duty felt.
Best Value: HEAD Tour — reliable performance, great price.
Best Practice: Tretorn Micro X (pressureless) — lasts for months.

How to Choose Tennis Equipment